Tsinghua, 1966
In 1966, at Tsinghua University, Ye watches her father, physicist Ye Zhetai, beaten to death at a Cultural Revolution struggle session. She is sent to a labor camp in Inner Mongolia, turns down a deal that would save her and ends up recruited to Red Coast, a secret military base. Bit by bit she realizes the project isn't about weapons. It's an attempt to talk to life beyond Earth.